Monochorionic diamniotic twins boy girl

Any one have mcda twins with gender boy and girl.tell me about it.i already searchef on google.but in all the search results says that mcda twins have only one gender.that is it may be two boys or. Monochorionic twins are identical twins who share one placenta. This occurs in approximately 70 percent of pregnancies with identical twins. Monochorionic-monoamniotic twins are identical twins who share both a placenta and an amniotic sac. Monochorionic-diamniotic twins are identical twins who share a placenta but not an amniotic sac Monochorionic Diamniotic Twins. Graphic of monochorionic diamniotic twins (MDT) shows a thin membrane formed by the apposition of the 2 thin layers of amnion . There is a single placenta and a single chorionic sac . Vaginal US in an early MDT pregnancy shows a single chorionic sac , 2 yolk sacs , and 2 tiny embryos The terms MoMo and mono-mono are short for monoamniotic-monochorionic and refer to twins that are monozygotic multiples—those who develop in a single amniotic sac and share a placenta. The words literally translate to mean a single chorio (outer membrane surrounding an embryo) and a single amniotic sac (the bag of waters that contains the fetuses) A monochorionic diamniotic (MCDA) twin pregnancy is a subtype of monozygotic twin pregnancy. These fetuses share a single chorionic sac but have two amniotic sacs and two yolk sacs. Epidemiology It accounts for the vast majority (70-75%) of mo..

Monochorionic Diamniotic twins boy and girl ? BabyCente

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Objective: To perform a systematic review and meta-analysis of the effects on the surviving twin of single fetal death comparing monochorionic to dichorionic twins to report the rates of co-twin death, preterm delivery, and neurologic morbidity in the surviving fetus. Data sources: MEDLINE (inception-December 2010), EMBASE (inception-December 2010), The Cochrane library (inception-December. When the babies each have their own placenta, it's called a dichorionic twin pregnancy (di = 2, chorion = placenta), when the babies share a single placenta, they're called monochorionic twins (mono = 1, chorion = placenta) genoemd. If both babies have their own amniotic sac, it's referred to as a diamniotic genoemd. When both babies share a single amniotic sac, they're named monoamniotic twins Brandon and Brenda type twins are referred to as DiDi twins or Diamniotic-Dichorionic. Meaning the babies have separate sacs and separate placentas. This pregnancy can produce a boy/girl, boy/boy and girl/girl combination. Probably with the least amount of risk of the twin pregnancies, DiDi twins have less complications

Monochorionic twins Birth defects & complications

i have diamniotic monochorionic pregnancy. will it be a boy or a girl type or will it be same gender type? Answered by Dr. Michael Ginsburg: Identical twins: Identical twins (also called paternal) created from. Twin 2 was a phenotypically normal girl with a birth weight of 2,365 g and normal female external genitalia. Both neonates had a good start with Apgar scores of 10 after 5 min. Histological examination of the placenta showed a monochorionic diamniotic placenta pointing to a joined blood circulation Five other cases (cases 2-6), five pairs of a boy and girl with CBC, Yoshida K, Kitani Y, Saito Y (2003) Monochorionic diamniotic twins discordant for the external genitalia (in Japanese).. Difference between identical and fraternal twins. Identical twins are monozygotic, which means that the twins emerged from a single fertilized egg cell which split and later on developed into 2 embryos.However, there are also 2 types of identical twins which are monochorionic-diamniotic twins and monochorionic-monoamniotic twins An ultrasound scan obtained at six weeks of gestation was reported to show a monochorionic, diamniotic twin pregnancy and a third sac with a nonviable fetus. 46,XY[91]/46,XX[9] in the girl and.

Monochorionic Diamniotic Twins - an overview

  1. These are known as dichorionic-diamniotic twins. The babies may be boys, girls, or a combination of both. Like siblings born from different pregnancies, these babies may (or may not) look very similar to each other. Depending on when the fertilized egg splits, identical twins may also be dichorionic-diamniotic
  2. monochorionic diamniotic (MCDA) twins - share a single placenta with a single outer membrane and 2 inner membranes; monochorionic monoamniotic (MCMA) twins - share both the inner and outer membranes; All non-identical twins are DCDA, and a third of identical twins are DCDA
  3. Diamniotic-monochorionic Twins. These types of twins share a chorion and a placenta but are in separate amniotic sacs. Monoamniotic-monochorionic Twins. These types of twins share a chorion, placenta, and an amniotic sac. This is the rarest type of twin, and it means a riskier pregnancy as the babies can get tangled in their own umbilical cords
  4. Twins that are dichorionic are by definition also diamniotic, since each amniotic sac has its own outer membrane Keywords: placental fusion, dichorionic-diamniotic twin pregnancy, twin-to-twin transfusion syndrome INTRODUCTION in this case being boy and girl, without polyhydramnios in one twin or oligo- twin I was a girl of 1,200 grams (50%.
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Though most monochorionic twins are born healthy, up to 15 per cent of twins who share a placenta have twin-to-twin transfusion syndrome (TTTS) (NICE 2011, NHS 2019, RCOG 2016, TAMBA nd). TTTS happens when there is an imbalance in the placental blood vessels, meaning one twin gets too much blood and the other gets too little All twins with identical gender (i.e. boy-boy and girl-girl twins) were identified from the electronical databases of each hospital. Walther FJ, et al. (2009) The pregnancy and long-term neurodevelopmental outcome of monochorionic diamniotic twin gestations: a multicenter prospective cohort study from the first trimester onward. Am J Obstet. Monochorionic-diamniotic (MCDA) twins are twins that share a placenta but have their own amniotic sac. They are almost always monozygotic, meaning that they come from one egg that is fertilized by one sperm, and therefore are identical. Monochorionic-diamniotic twins occur in 0.3% of all pregnancies and 70 to 75% of all monozygotic twin.

Monoamniotic-Monochorionic Twins: Overview and Risk

It concluded that dichorionic twins deviates from singleton reference charts at approximately 32 weeks. Monochorionic twins deviates at 28 weeks. These deviations are one of the reasons why a singleton fetal weight chart shouldn't be applied to twins. The normal declaration of growth in twins can seem like an issue, even if it isn't Monochorionic twins are monozygotic (identical) twins that share the same placenta.If the placenta is shared by more than two twins (see multiple birth), these are monochorionic multiples.Monochorionic twins occur in 0.3% of all pregnancies. Seventy-five percent of monozygotic twin pregnancies are monochorionic; the remaining 25% are dichorionic diamniotic Monochorionic Diamniotic (MCDA) Twins. These types of twins are enclosed in a single chorion and share the same placenta, but each is snugly housed in a separate amnion (the inner membrane). If one twin is a boy and the other is a girl, the twins are always fraternal (not identical) twins. Girl-girl twins and boy-boy twins may be identical.

monochorionic, diamniotic twin pregnancy and a third sac with a nonviable fetus. A sub- plicated, and at 37 weeks of gestation, a healthy boy (weighing 2114 g) and a healthy girl uneventfully. Twin 1 was a boy weighing 2.09 kg and twin 2 was a boy weighing 2.08 kg. As the inter-twin septum was present upon delivery, this case was a false positive. Discussion Spontaneous septostomy, or pseudo-amniotic twin in monochorionic diamniotic twin pregnancy has been described, but only one case report of spontaneou The term identical twins is generally used as a synonym for monozygotic (MZ) twins. Both terms assume that that the twins developed from the same fertilized egg (zygote), have identical DNA, and therefore look identical. But, as explained here, identical twins do not always look exactly the same. And male/female twins certainly don't look The monochorionic diamniotic twin pregnancy continued. Amniocentesis in both amniotic cavities at Twin 1 was a slightly hydropic 2265-g boy with hemoglobin 23.6 g/dL (14.6 mmol/L). Twin 2 was a normal 1550-g girl with hemoglobin 12.0 g/dL (7.4 mmol/L). Karyotyping was performed on blood samples at 1 week, and again a Monochorionic twins are monozygotic (identical) twins that share the same placenta.If the placenta is shared by more than two twins, these are monochorionic multiples.Monochorionic twins occur in 0.3% of all pregnancies. 75% of monozygotic twin pregnancies are monochorionic; the remaining 25% are dichorionic diamniotic. If the placenta divides, this takes place after the third day after.

Monochorionic would mean single egg covering sac and monoamniotic would mean single amniotic sac. MoMo twins, therefore, mean that they are babies forming in the same amniotic sac and have just the single covering egg sac. They are otherwise also called mono identical twins. This is most often referred to as a high-risk pregnancy 1. Ultrasound image of a monochorionic diamniotic twin pregnancy at 12 weeks. The intertwin membrane inserts on the placental disk as an empty lambda sign formed by the apposition of the two thin amniotic membranes (thin arrows) that separate the twins. The twins are, thus, separated by two layers (amnion-amnion). 2 Later in gestation, monochorionic diamniotic pregnancies can be differentiated from dichorionic diamniotic and monochorionic monoamniotic twin pregnancies through a systematic evaluation of the placental number, fetal gender, and intertwin membrane. 6-10 In monochorionic pregnancies, there is a single placenta and a thin intertwin membrane.

Selective focus ultrasound twins stock pictures, royalty-free photos & images. Identical twin boys obstetrical ultrasound Anatomy scan of twin gestation 26 weeks 2 days, monochorionic diamniotic. Fetal anatomy and gastrointestinal tract visualized with normal appearance, kidneys, bladder, stomach. Male fetus genitalia I have Monochorionic Diamniotic twin boys that were born at 30 weeks gestation. My hopes for this site are to encourage proper advocacy from mothers pregnant with Monochorionic twins. I will be including official documentation to support everything I am sharing here Introduction. Fetal loss in monochorionic twins is much higher than in dichorionic pregnancies. Thus, in a prospective study, in which chorionicity was assessed by ultrasound examination at 10-14 weeks of gestation, there was at least one fetal loss before 24 weeks of gestation in 12.7% of the 102 monochorionic and in 2.5% of 365 dichorionic pregnancies Twin-to-twin transfusion syndrome (TTTS) is a rare pregnancy condition affecting identical twins or other multiples. TTTS occurs in pregnancies where twins share one placenta (afterbirth) and a network of blood vessels that supply oxygen and nutrients essential for development in the womb. These pregnancies are known as monochorionic

Monochorionic diamniotic twin pregnancy Radiology

Jun 20, 2011. Monochorionic. by: Anonymous. If you have 1 placenta, but 2 sacs, then your twins are identical, but should still be safe from cord entanglement. I gather that is your concern. That is an issue in mo/mo twins, which are 1 placenta, 1 sac, so that your babes are floating around in a shared space A dichorionic diamniotic (DCDA) twin pregnancy is a type of twin pregnancy where each twin has its own chorionic and amniotic sacs. This type occurs most commonly with dizygotic twins, but may also occur with monozygotic twin pregnancies. This type of pregnancy may have characteristic findings on ultrasound A healthy boy and girl were delivered by elective caesarean section at 36 weeks, 5-days gestation. In the second case, the patient underwent selective reduction of the monochorionic twins, resulting in a single pregnancy that was vaginally delivered without any problems at 38 weeks 0-days gestation

Permanent Redirect. The fetuses were sex-discordant in ultrasonography despite being monochorionic twins. After birth, the girl and boy showed normal phenotypes but they showed blood chimerism in karyotype and blood. But twins are automatically deemed a high-risk pregnancy by doctors—and ours were what's known as monochorionic-diamniotic twins, meaning they had different amniotic sacs but shared a placenta. Some twins learn to share at a very young age. The majority of identical twins will share the same placenta but have separate amniotic sacs (monochorionic diamniotic), although a smaller percentage of identicals have their own of each one (dichorionic diamniotic) Fraternal twins can be of either gender and they can be a combination of boys and girls, Both of these far, It is a genetic abnormality known as Turner Syndrome, forming two embryos, fraternal twins are as alike as siblings would be — in other words, there is one case where this happens, far more likely than different sex mcda twins

No cases of the chromosomal abnormality that sometimes results in boy-girl sets of monozygotic twins have ever been identified in MoMo twins. Is it dangerous for twins to share a placenta? In uncomplicated monochorionic twin gestations, the blood exchange between both babies is equal, and the placental mass is equally shared Diamniotic identical twins may share the same placenta (known as monochorionic) or not (dichorionic). All monoamniotic twins are monochorionic. Also note that any monochorionic or monoamniotic twins are identical twins. This condition does not occur in fraternal twins. The later in pregnancy that twinning occurs, the more structures will be shared Identical twin boy obstetrical ultrasound Anatomy scan of twin gestation, monochorionic diamniotic. Fetal anatomy visualized with normal appearance 4 chamber heart, great artery views, head, brain, face, spine, neck, chest, abdominal wall, gastointestinal tract, kidneys, bladder, extremities and skeleton There are four types of twins: Diochorionic-diamniotic twins either never divided (aka are fraternal twins) or divided within the first four days and have two separate amniotic sacs and placentas. This includes almost all fraternal twins. Monochorionic-diamniotic twins share the same placenta, but have two amniotic sacs. This occurs when the embryo splits in 4-8 days and includes 60-70% of all.

Twin to Twin Transfusion Syndrome - University of Washingto

  1. monochorionic twin placentas may have vascular anastomoses, and in partial monoamniotic twins, the umbilical cords may entangle, so antenatal surveillance should be similar to that for monochorionic and monoamniotic twin pregnancies, respectively. Also, rarely dizygotic twins may have a monochorionic placentation, and thus, boy-girl pairs.
  2. In the case of Monochorionic twins, the embryo, during the process of growth, emerges as two separate embryos, each developing a placenta that connects to the mother's uterus. If each embryo develops its own amniotic sac, it is called Diamniotic, and the two embryos will share the same egg sac while advancing in their own amniotic sacs
  3. ation showed a monochorionic diamniotic twin pregnancy. First trimester nuchal translucency measurements of the fetuses were 1.6 and 2.7 mm. (two boys, one girl) present.
  4. Identical twins are pretty rare. Mo-di identical twins are actually more common than di-di identicals, despite the fact that fraternal twins (which are always di-di) are the most common type of twin overall. But the most uncommon twins of all, the rarest of the rare, are the monochorionic-monoamniotic twins, a.k.a. monoamniotic, mono-mono, and.
  5. These twins are called monochorionic diamniotic. Two thirds of identical twins are monochorionic diamniotic. If the division happens after the ninth day, your twins will share a placenta and will also be in a single sac (monochorionic monoamniotic). This is rare, and only happens to one per cent of all identical twins
  6. Fetus in fetu (FIF) is a rare congenital anomaly resulting from abnormal embyogenesis in monochorionic diamniotic twins and appears as a cystic mass containing fetus-like structures mainly in the retroperitoneum of infants. Although there is a theory that FIF is a highly differentiated teratoma, it
  7. There are several possible forms of monozygotic twins. The most common type of identical twinning is referred to diamniotic/monochorionic (Di/Mo). Division does not occur until the blastocyst stage ( 4 - 8 days after conception). Diamniotic/monochorionic twinning will occur if the ova splits between 4-8 days after fertilization

Monochorionic-Diamniotic twins are almost always monozygotic, with a few exceptions where the blastocysts have fused. Monochorionic twins share the same placenta, and thus have a risk of twin-to-twin transfusion syndrome. Days 4-8 Monochorionic-Monoamniotic: Monochorionic twins share the same amnion in 1-2% of monozygotic twin pregnancies A monochorionic diamniotic (MCDA) twin pregnancy is a subtype of monozygotic twin pregnancy. These fetuses share a single chorionic sac but have two amniotic sacs and two yolk sacs. Boy/Girl Monozygotic (Identical) Twins. Mirror Image Twins. Superfetation: Twins Conceived Separately. Heteropaternal Superfecundation: Twins with Different.

Monochorionic diamniotic twin pregnancy Radiology . October 2019. A twin ultrasound at 6 weeks needs to be done vaginally to detect twins this early in your pregnancy. When you're 6+0 weeks pregnant, your baby's hearts should be beating - and the sonographer should be able to detect them at this point Twin-twin transfusion syndrome (also called TTTS or twin to twin transfusion syndrome) is a condition in which the blood flows unequally between twins that share a placenta (monochorionic twins). TTTS occurs in about 10 to 15 percent of monochorionic, diamniotic (two amniotic sacs) twins Twin 1 was a phenotypically slightly hydropic normal boy, with birth weight 2265 g and hemoglobin 14.6 mmol/L, and Twin 2 was a phenotypically normal girl, with birth weight 1550 g and hemoglobin 7.4 mmol/L. Histological examination of the placenta concluded that it was a monochorionic diamniotic twin placenta Monochorionic twin pregnancies are related to higher risk of scan at 6.0 weeks of pregnancy revealed a MC diamniotic twin pregnancy. Because a discordant genital sex was observed at 15 weeks QF-PCR analysis of blood from twin 1 (recipient, boy) and twin 2 (donor, girl) Figure 2

Can Monochorionic Diamniotic twins be different sexes

Complications of a Monochorionic Placenta. Complications that can arise in monochorionic pregnancies are due to unequal sharing of blood, blood volume, placental nutrients or a combination of these. Essentially the existence of anastomoses between twins links the well-being of each twin to the other. These connections are believed to be. The other 25% are identical twins, and among these, three out of four (75%) will share a single placenta (monochorionic). Perinatologist and twin expert, Dr. Larry Rand, discusses the importance of early diagnosis and frequent monitoring of monochorionic twin pregnancies in particular to ensure any potential complications are addressed Twins are referred to as either monoamniotic - ie sharing the one inner sac, or diamniotic ie having developed in separate sacs . Monoamniotic twins are always identical (monozygitoc) but may be either monochorionic or dichorionic ie in the same or separate placenta's. Diamniotic twins can by either identical or fraternal, and either mono. Dichorionic diamniotic (DCDA) - The twins have their own placenta, inner membrane and outer membrane. DCDA occurs in about one-third of identical twins. Monochorionic diamniotic (MCDA) - The twins share the same placenta and chorion but will have their own amnion. Monochorionic monoamniotic (MCMA) - The twins share everything Mono Di twins occur in 0.3% of all pregnancies. 75% of monozygotic twin pregnancies are monochorionic; the remaining 25% are dichorionic diamniotic. Are Mono Di twins high risk? Almost all twin pregnancies are considered high risk and you will most likely be seen by the Maternal Fetal Medicine unit exclusively, or through periodic visits in.

The now four-year-old boy and girl are monozygotic on their mother's side sharing 100% of their mother's DNA, but are like siblings on their father's side, sharing only a proportion of their. The two latter options always result in identical twins. This means the twins will both be girls or both be boys. The first though, the mysterious di/di twins, can be either fraternal twins OR identical twins. 75% of the time, the twins will be fraternal. 25% of the time though, they will actually be identical The twins can be two girls, two boys, or a boy and a girl. Identical twins occur when a single fertilized egg splits and develops into two fetuses. Identical twins might share a placenta and an amniotic sac or the twins might share a placenta and each have separate amniotic sacs. Genetically, the two babies are identical

Can boy and girl twins look the same? - AskingLot

boys or two girls), or different genders (one boy and one girl). Identical twins (also called monozygotic twins) come from a single fertilized egg that splits into two separate embryos during the first two weeks of development. Because they come from the same egg, identical twins are always the same gender. If two fetuses are different genders. This situation is called dichorionic-diamniotic twins) (Di-Di twins). Di-Di twins are formed by the splitting of the embryo within 2-3 days after fertilization. In contrast, two-third of the monozygotic twins share the same placenta and two separate amniotic sacs (monochorionic-diamniotic twins) (Mono-Di twins) Matthew and Noah identical twins, monochorionic, monoamniotic, both had anencephaly Oran and Jude identical twins, monochorionic, diamniotic, shared the placenta Elizabeth and Lauren identical twins, monochorionic, monoamniotic Please don't hurt me, I'm already hurting enough Chrissy's story about her fraternal twins Cayden and Carter Book Types of placenta in a twin pregnancy • a single (monochorionic) placenta. • 2 separate (dichorionic) placenta . In monochorionic twins there is one chorion around both babies which means they share one placenta and the term monochorionic is used. Triplets and Quads can also be monochorionic While all fraternal twins are 'di/di', this occurs 20 - 30% of the time in identical twins. Most of the time in identical twins the zygote will split after 2 days, resulting in a shared placenta, but two separate sacs. These are called monochorionic, diamniotic ('mono/di') twins.These twins are very similar genetically, and share a single.

Mono/di twins are considered mid-risk in the twin world due to the risk for twin-to-twin transfusion syndrome (TTTS). TTTS is a condition where blood flows from one twin to the other. This results in one baby getting to much blood and the other baby not getting enough Monochorionic-Monoamniotic (Mo/Mo) Identical twins that develop in the same inner and outer sacs. Monochorionic-Diamniotic (Mo/Di) Identical twins with one outer sac (chorionic) and two inner sacs (each embryo has its own amniotic fluid and sac). Both mm/mo and mo/di twins frequently share a single placenta Little is known about the mechanism of CGG instability and the time frame of instability early in embryonic development in the fragile X syndrome. Discordant monozygotic twin brothers with the fragile X syndrome could give us insight into the time frame of the instability. We describe monochorionic diamniotic twin brothers with the fragile X syndrome who had different CGG repeats and different.

How do you know if your twins are fraternal or identical

Introduction. Monochorionic diamniotic (MCDA) twins identified by ultrasound in early pregnancy are rarely dizygotic. Since Shouter et al. first reported that MCDA twin pregnancies can occur in dizygous (DZ) twin pregnancies, there have been about ten reports of such cases [].MCDZ twins can be easily overlooked except in cases of discordant sex discovered during prenatal care or delivery of. We report a very rare case of monochorionic dizygotic twins conceived spontaneously. The fetuses were sex-discordant in ultrasonography despite being monochorionic twins. After birth, the girl and boy showed normal phenotypes but they showed blood chimerism in karyotype and blood group type

Co-twin prognosis after single fetal death: a systematic

Conjoined Twins; Diochorionic-Diamniotic; Dizygotic; Fraternal Twins; Identical Twins; Monochorionic-Diamniotic; MoDi Twins: Monochorionic Diamniotic Pregnancy. If you're carrying identical twins, they could be mo-di or monochorionic diamniotic. But what exactly does that mean for you and your babies? Does sharing the same placenta require. There was single large On sonography she was diagnosed to have twin monochorionic diamniotic placenta with International Journal of Advances in Medicine | April-June 2014 | Vol 1 | Issue 1 Page 63 Seth S et al. Int J Adv Med. 2014 May;1(1):63-65 polyhydroamnios in donor segment and severe oligoamnios in parasitic twin Monochorionic (MC) twins are at increased risk for perinatal mortality and neonatal morbidity compared with dichorionic twins. 1 This is because of the haemodynamic imbalance caused by placental vascular anastomoses. 1,2 In the case of fetal death, these vascular anastomoses put the surviving sibling at increased risk of co-twin death or adverse neurological outcome. 3,4 Even after excluding. in monochorionic diamniotic twins. A 41-year-old woman, pregnant with twins, was . referrend at 12 weeks' gestation because the combined test was altered. Serial ultrasonographic examination suggested that twin A may have had arthrogryposis, micrognathia, kyphoscoliosis, fixed flexion of the limbs, polyhydramnios, myocardia

for those with mono/di twins

The TAPS Trial Monochorionic twin

Case Report. Monochorionic Pseudomonoamniotic Twin Pregnancy Revealing Fetal Demise. A Unique Case Sotiriou Sotirios 1 *, Koukoura Ourania 1, Sofoudis Chrisostomos 2, Zacharos Nikolaos Marios 3, Kailas Pangiotis 3, Daponte Alexandros 1 and Garas Antonios 1. 1 Department of Obstetrics and Gynecology, University Hospital of Larissa, Greece. 2 Department of Obstetrics and Gynecology. Unequal growth between genetically identical monozygotic twins in the womb may be triggered in the earliest stages of human embryo development, according to a new study With identical twin girls due this winter, the Orlando-based architectural and engineering recruiter, 31, opens up to Us about her great expectations. Vienna Girardi Anthony Bing

and remained unremarkable until she delivered twin girls by C-section at 33 weeks' gestation. Twin A weighed 4 lbs, 8 oz, and twin B weighed 4 lbs, 13 oz; both twins had a 5-minute Apgar of 9. Discussion Monochorionic-monoamniotic twins are a rare occurrence, with the true incidence of these types of twins being 1/100 twin gestations or 1. Monochorionic diamniotic twins: Most common type of monochorionic twins. Two separate amnions are present. This type of twinning occurs when the egg divides between day 3 and day 8. Monochorionic monoamniotic twins: A single amniotic sac is present. This occurs when the division of the egg happens between day 8 and day 13 after fertilization No, they are not always in the same amniotic sac. It depends on when the split to form two embryos occurred. Identical twins may share 1) both the amnion and the chorion, 2) have separate amnions and share a chorion, or 3) have separate amnions an.. Monochorionic twins will also all have a vascular anastomoses, so it is important to know if they are monochorionic so that their growth can be closely compared to see if one baby is receiving more blood/flow/nutrition than the other. The last way I can think of to determine the kind of twins is if you see twins that are opposite sex